We have turf tires and found that the tiller not covering either rear tire to be a HUGE pain. Even when we moved the tires in all the way and shifted the tiller we couldn't completely cover either tire and the tiller wanted to till at an angle / because the tires were rolling back and forth over the edge between tilled and untilled ground.
We have the same problem with the WheelHorse C-16 and it's 36" forward rotation tiller, you just can't cover the wheels completely but becausee neither rear wheel sticks out more than 1" past the tiller tines, it is managable.
The Kubota ~48" tiller we had was also a forward rotation tiller and it constantly tried to push the tractor forward and shook violently over hard unbroken ground. This is even with controlling the digging depth and it left clumps behind, not a nice smooth planting bed.
The new 60" reverse rotation tiller has similar tine counts and about the same number of rows for the width but doesn't shake the tractor and leaves a much more even bed without the larger clumps. It is also much easier to control ground speed because the tiller tries to hold back on the tractor and not push it forward (no forward/brake/forward pedal gymnastics).
The least expensive new tiller I could find in the area for a 5' model was $1395, I paid just under $2k for the LP with more tines, one more row of tines and reverse rotation and a 5 year gearbox warranty. For our situation, it was money well spent. We had looked at rear-tine walk-behinds and paid LESS for this PTO tiller than for a 36" rear-tine walker!
